Internal combustion engine



Jan. 3 1933. A. BUCHI 1,893,127

' I INTERNAL COMBUSTION ENGINE Filed Nov. 17, 1927 REDUCING VALVE INVGN722R Patented Jan. 3, 1933 UETED STATES PATENT OFFICE ALFRED BUCHI, OIWINTERTHUR, SWITZERLAND INTERNAL COMBUSTION ENGINE Application filedNovember 17,1927, Serial No. 234,015, and in Switzerland November 30,1926.

This invention relates to an arrangement in internal combustion engines,with which,

starting is facilitated by the requisite ignition temperature being morereadily reached.

The invention consists in providing means, whereby the combustion air isheated before entering the combustion cylinder by being driven through ablower. This heating may be effected while the engine is being startedor preferably before the internal combustion engine is put intooperation. The heating action in the blower can be increased by the airwhich is conveyed by the blower being circulated several times through aby-passlocated between the delivery space and the' suction space of theblower by the pump. The

motor for driving the blower can be operated by the means for adjustingthe control of the internal combustion engine to the stop-ping, startingand working positions; Similarly the opening and closing of the by-passbetween the delivery and suction space of the blower may be eltected bythe same means.

When exhaust gas turbines are used for driving charging blowers, for thestarting-operation said blowers may be driven by exhaust gas turbines,which are operated with another driving'medium, for instance withstarting air from the starting air bottle.

In the accompanying drawing a constructional example of the invention isshown diagrammatically.

In the drawing: 1

Figure 1 shows a diagrammatic elevation of an engine embodying theinvention with dotted positions 0, I, II and III correspond-.

ing respectively to the stop position, an in termediate position, thestarting position and the running position of the control lever of 40the engine. v

Figure 2 shows a vertical section of the cylinder at the part where theair pipes enter.

-1 is the cylinder of an internal combustion engine to which thecombustion air is conveyed through the pipe-2. The exhaust gases leavethe engine through the pipe 3. In the -example shownin the drawing thecombustion air is delivered by a blower 4 driven by a waste gas turbine5. The arrangement ac- 0 cording to the present invention consists in adevice 6 by means of which air under pressure stored in the vessel 7 canbe admitted to the turbine 5, by which the latter is putin operation andthe charging blower 4: is caused to rotate. The arrangement may be suchthat a valve 20 in the device 6 is operated against a return spring 18by the device 8 for adjusting the control of the internal combustionengine to the stopping, starting and working positions. In thearrangement shown this is done by means of the rods 9 and 10, collar 21and bell crank lever 19. The

positionO of the lever 8 corresponds to the stop position, the positionII to the starting position, and the position III to the workingposition. The arrangement is such that the admission of driving fluid tothe turbine 5 already commences in a position of the lever 8 lyingbetween the stopping and starting positions. At this moment (position I)the internal combustion engine will still be stationary and the airleaving the blower 4 will not have commenced its regular flow throughthe internal combustion engine. It can at the most pass through thosecylinders, the inlet and outlet members of which are open at the sametime. The amount of air conveyed will thus at the most be very small andconsequently the rotation of the rotor wheels in the same air will causea considerable heating of the latter. On the lever 8 being turned fromthe position I into the position II, the starting air valves in thecasing 11 will be operated, which valves may also according to thepresent invention, a stop valve 15 is provided in it. This stop valve isoperated by the device 8 for adjusting the control of the internalcombustion engine'to the stopping, starting and working positions.

The valve 15 is opened by the rods 9 and 10 and the collar 21. When thelever 8 is turned into the sto ping or working positions, the valve is cosed by the spring 16, and when the lever 8 is turned into the positionI, the collar 21 on the rod 10 strikes against the lever of the valve15, opening the latter, so that the air conveyed by the blower 4 canflow back into the suction space 14 and can be circulated within thepump.

The positionI corresponds actually to the stopping position of theinternal combustion engine, with the difference that in that case theblower 4 will be kept in operation for instance by means of compressedair. No

driving medium will be supplied to the internal combustion enginebesides the air preheated in the blower. A

The lever 8,.which is the operative handle for controlling the internalcombustion engine, is mounted on a. shaft 24, and on this shaft areeccentrically pivoted levers similar to 25 for operating inlet andoutlet valves,

and the like, and starting air valves. The lever 25 operates thestarting air. valves and has a roller 28 for coacting with the cam 27which rotates on the shaft 26'. As a result of the eccentric mounting ofthe lever 25, only when its centre of oscillation is displaced downwardby the lever 8 in position 11 of the latter does the cam27 force it tooperat the starting air valves.

What I claim is: 1. In combination with an internal comblis- .tionengine, a turbo-blower for suppiying combustion air to said engine,piping be tween said blower and said engine, piping between delivery andsuction side of said blow-,

\ blower prior-to the starting of said engine for the purpose of heatingthe air, said means for driving said turbo-blower including a source ofcompressed air and means for conmeeting said source of compressed air tothe turbine of said turbo-blower.

1.3. In combination with an internal con bustion engine; a turbo-blowerfor supplying combustion air to said engine, piping between said blowerand said engine, piping between 3 delivery and suction side of sai'dblower and a valvemember therein, means independent L 9 of said enginefor driving said turbo-blower source of compressed air to saidturbo-blower,

prior to the startingof said engine'iorthe purposeof heatin' theair,-said means for driving said turbolower inc uding a source ofcompressed air, means for connecting said a valve between said source ofcompressed air and said turbo-blower and means for opening and closingsaid valve.

.4. 'In combination with an internal com bustion engine, control meansfor the valves thereof, a. turbo-blower for supplying combustion air tosaid engine, p p ng between said blower and said engine, piping betweendelivery and suction side of said blower and a valve therein, meansconnected to said control means for said engine for opening and closinsaid valve, and means independent of said engine for driving saidturbo-blower prior to the starting of said engine for the purposeofheating the air.

5. In combination with an internal combustion engine, a turbo-blower forsupply ing co bustion air to said engine, piping between said blower andsaid engine, piping between delivery'and suction side of said blower anda valve member therein, means independent of said engine for drivingsaid turbo-blowerprior to the starting of'said engine for the purpose ofheating the air, said means for driving said turbo-blower including asource of compressed air, a turbine connected to the turbo-blower, meansfor connecting said source of compressed air to the said turbine of saidturbo-blower, a valve between said source of compressed air and saidturbine, means for opening and closing said valve, and piping meansbetween the internal combustion engine and said turbine.

6. In combination with an internal combustion engine, control means forthe valves thereof, a turbo-blower for supplying combustion air tosaid'engine, piping between said blower and said engine, piping betweendelivery and suction side of said blower and a valve member therein,means independent of said engine for driving said turbo-blower prior tothe starting of said engine for the purpose'of heating the air, saidmeans for driving said turbo-blower including a source of compressedair, means for connecting said source of compressed air to saidturbo-blower, a valve between said source of compressed air and saidturbo-blower and means for opening and closing saidvalve, said meansbeing connected. to said control means for said internal combustionengine.

In testimony whereof "I have signed my name to this specification. I

- 1 ALFRED BUGHI,

